[users@httpd] ProxyPresearveHost question / situation

[DF <df@xxxxxxxxxxx>]

Hi,


We have the following setup:

'Net  <----> Load balancer <-----> Apache 2.2.2  <------->  Apache 1.3.34

*Note: Apache 2.2.2 and 1.3.34 are on the same server, listening on 
different ports.

Apache 2.2.2 is the front end web server that receives the clients 
requests.  It handles all requests except for URLs asking for files with 
a particular extension.  These files are processed by a module that only 
works with Apache 1.3.x. For those "special" files,  Apache 2.2.2 
performs a rewrite(mod_rewite) that hands off the processing to Apache 
1.3.34.  To get this to work, I had to use the ProxyPreserveHost On 
option so Apache 1.3.34 would know what host to use.   Works great 
except for one domain.  This "special" domain also has forums that are 
running on a set of internal web servers. 

So now I need to get a "normal" reverse proxy working, 
ProxyPass/ProxyPassReverse.  The problem is, this won't work with 
ProxyPreserveHost On.

Here is the config (shared by Apache 2.2.2 and Apache 1.3.34):

<VirtualHost 192.168.107.37>
 ServerName www.domain.com
 ServerAlias domain.com
 DocumentRoot /data/domain.com

 <IfDefine REVERSE_PROXY>
   ProxyPreserveHost On
   RewriteEngine on
   RewriteCond %{LA-U:SCRIPT_FILENAME} \.ext$ [NC]
   RewriteRule .* http://192.168.107.37:8080%{REQUEST_URI} [P,L]
   ProxyPassReverse / http://192.168.107.37:8080/
 </IfDefine>

 # Push through to forum server (proxy)
 RewriteEngine On
 RewriteRule /info/forum/(.*) /community/forum/ [R,L]

 <IfModule mod_proxy.c>
   ProxyPass /community/forum/ http://forums.domain.com/
   ProxyPassReverse /community/forum/ http://forums.domain.com/
 </IfModule>

</VirtualHost>

With this configuration:
- When I hit Apache 2.2.2 for anything but files with the 'ext' 
extension, it handles it with no problems.
- When I hit Apache 2.2.2 for any file ending with .ext, it get 
rewritten and passed to apache 1.3.34.

Problem:
- When I hit Apache 2.2.2 with a request for /community/forum/ I just 
get redirected to the sites home page, I don't get the forums as 
expected.  ProxyPresearveHost is doing it's job of preserving the host, 
but in this case I don't want it to. I tried putting ProxyPreserveHost 
Off before the first ProxyPass entry, same result.  I tried putting it 
at the bottom of  the <IfDefine REVERSE_PROXY>, same problem. Can 
PresearveProxyhost not be turned on then off again?


Notes:
1)  Apache 2.2.2 and Apache 1.3.34 are using the same Vhost config file, 
defines are used to control "who sees what".

2) Apache 2.2.2 is started with -DREVERSE_PROXY so it will process the 
REVERSE_PROXY block, while apache 1.3.34 is not passed any parameters, 
so it ignores the REVERSE_PROXY block.


Another question, have I over complicated the situation and there is a 
better solution?



Thanks,


David f.


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